Relay.



BEST AVAILABLE COP No. 896,808.' 7 PATENTED AUG` 25, 1908.

F. L. DODGSON.

RELAY.

.APPLICATION FILED MAR, 2g 1906. RENEWED FEB. 21. 1908.

3 SHEETS-SHEET l.

PATENTED AUG. 25, 1908. F. -L. DODGSON.

RELAY.

APPLICATION FILED MAB.. 2. 1906. lRENIBWBD FEB. 21, 190B.

No. 896,808. PATENTED AUG. 25, 1908.

F. L. DODGSON".

' RELAY. APPLIGATION FILED 11.1.3.2, 1906. RBNBWBD PEB. 21. 1908.

3 SHEETS-SHEET 3.

UNITED' STATES fkTEN-T FICE. l"lt.'\NK LEMQNT DODGSON, OFBUFFidl-('lgggwll SSGNOR TO GENERAL ltAllV/l SIGNAL'COMPANY, OF BUFFALO,NEWT YORK, CORPORATION OF NIV YORK.

i antw. i

No."89l6.,808. Specification of Letters Patent.- Patented Aug. 25, 1908.

' Application mea March 2; 1906. serrano. 303,860. Renewed February 21,190s. segnalano. 417,088.

To all whom 'it may concern: ture 12 are Contact arms 14, which, when"VBe it known thatfI, FRANK LEMONT Donor the magnets are denergized, makeelectrical. SON, a citizeny of the United States, residing connectionwith the hack contacts 15, and at Buffalo, in the county of ErieiandState of' which, in the energized state of the niagnets .5 Newr York,have'invented a new and useful make electrical connection with thecontacts Improvement in Relaysjof v which Ythe fol- 16. In. thodrawings, l have shown. as the lowing is a specification. desirahleconstruction for the uses in ques- My invention relates to relays andmore tion carhon front contacts and platinum particularly to relays forrailway switching hack contacts. The/ ira-leading wires conand signalingapparatus. In relays for such neet with the. binding-posts 17, which arees uses certain requirements of construction connected with theirrespective contact arms and arrangement are imposed, which re- 14 byllexihle conductors 18. 'lhe circuits ol ('uirements for the successfuloperation are the front contacts 16 lead out through the r iscovcred andthe necessary construction binding-posts 19, and the circuits ol' thehack reached hy experiment and test rather than vcontacts lead outthrough the binding-posts 'gg hy any predetermined engineering plan. I20. All of the binding posts are secured to shall point out certain ofthese requirements, and through. the carrying plate 2, are insual terdescribing my vinvention generally, and lated therefrom and aredamp-proof thereinv 'show how my invention meets the same. Havinggenerally described my apparatus,

ln th'e drawings herewith 1 have shown a l will point out the specialfeatures ahoye re- 7', four-arm, .eight-contact relay as a typical lerred to. form of 'my invention.y t' f ,'First, itis necessary that theworking Figure -I laan elevation, partly in section; parts hesymmetrically arranged, that the Fig; is a top plan view and Fig. 3 is ahoricontact arms he equally and properly spaced zontal section on theline :z3-:1r: of Fig. 1.1 and of the same, length. Repeated experigo-Like characters (if-reference indicate corment has shown. these to henecessary feares ondingparts. `T I tures in the perfect working of therelay. he housing of the apparatus -is made up This I have accomplishedby making the el ahase plate 1, a carrying'plate 2, and a haserectangular in form and making the surrounding glass or othernon-conducting housing rectangular in cross section. Thus 85 l'hody 3.The eripheries of the-body 3 are the contact arms are of equal length,equally seated within an es on the plates 1- and 2, spaced and placedsymmetrically with referandthe lparts are eld togethervhy screws 4. enceto the magnets and the magnetic field. NVith the use of Water-proofcement this 'lhis results in a higher elliciency and more housingaffords a damp-proof chamberor perfect action. 90 the working arts ofthe relay. The magnet Second, the rectangular and enlarged ends coresare ma e up of cylindrical bodiesqfhnd '6 of the cores secure aniiicreased magnetic. rectangular and enlarged poles or ends 6.elticieney and an equality of magnetickpull -|`he yhodies5 of the coresfit snugly through 'and equality of 'release which l have not holes inthe carrying plate 2 and are secured found attainable hy any other form,95 to it hy screws 7 passing through said plate Third, hy securing thecores to the carry and threaded in to rectangular ends or two ing plate2 hy screwing the. ends 6 thereto, diametrically op l osite` corners.rlhe windand by making the shells and magnet windings Sand the s iells 9are slipped over the .ings readily removable simply hy releasing cores 5and held down firmly on the plate 2 the connections at thebinding-posts, uu- 100 hy tlu` hlriding post yoke10, which, in turn,-screwing the nuts 11 and removing the yoke f' is held dii'wn hy nuts 11threaded to theup- 11), the coils of the magnets may he removed perends'rif the cores 5. The yoke 1.() carries and replaced. Withoutin' anymanner disturhg the binding posts for the circuit ol themaging theadjustment or the insu lationagaiuslgNY nets. currentor moisture of theother parts ol' the les 12 is an arnurture common to both magnetapparatus. This is of importance, since the cores. 'l`his armature is)ivotally secured to replacement of a defective coil may he at any lugsI3 which are secured to the )late 2, and time made by one not possessingthe neces- 'faces the rectangular ends 6 et the cores. sary knowledge orskill to adjust the entire Mounted with but insulated from the.armaapparatus. l 110 Fourth, by mounting all or" the parts von thecarrying plate liability to derangement, due either lo'expension oroontrecion or to the loosening of parte, is reduced to the miniinuin.

llnving thus described my invention and liu ving indicated its features,Wli'a't I claim is:

ln a relay, in combina-tion with the magnet coils, housing, and currylngplate, cores having enlarged and rectangular shapedends or poles, anarmature governed by said magnets and means for securing said cores inplace by securing said ends to said carrying plte.

In testimony whereof, I have hex" to set my hand in the presence of twoWitn" sees.

FRANK LEMONT DODGSON.

Witnesses:

ISAAC R. NOBLE, C. J. LEWIS.

